Easy BBYY!
Nice to see another person joining the ScrOG club!
I do have a few notes to say about it though, and please don't take it personally.
Trimming everything underneath the ScrOG IS a good idea, but you have to choose the right time to do it.
How far in are you? I would say maybe 3-4 weeks into 12/12?
I trim in weekly stages, usually starting 2-3 weeks prior to flipping the switch and always starting with the lowest growth. During this time it is usually the fan leaves and some shaded growth that is visibly lagging behind.
There are many ways to train a plant for a ScrOG, eg;
Plant topped to form 4 main tops which are then grown outwards in a [X] pattern, filling the screen as it goes along.
Or, the simple method of just bending the main growth under the screen and into the next hole, training all the surrounding new growth into the remaining holes.
You will soon learn your plants stretching characteristics to judge which branches will make it to the screen and at what speed, so you can time your flip much more precisely.
This will however depend on the type of media & system you are using, as some systems give explosive growth and lights need to be flipped much sooner. Like the Waterfarm I use in my grow journal.
I will carry on trimming 2-3 weeks in to 12/12.
Picking off 2-3 bits a day.
I find this doesn't stress the plant and stunt it.
Once the plants completely stop stretching, EVERYTHING below the screen goes!
At this point everything below the screen isn't getting enough light, the popcorn bud would be garbage, whereas all that popcorn could have contributed to 25-35% more weight in the top buds.
During flowering I selectively prune fan leaves off the buds to give deeper light penetration and better airflow.
I also pick off leaves early on in flowering to slow down some branches that are stretching more than others.
I never trim off the fan leaves from the top, I leave the top 3 alone. That includes the top one that doesn't poke out much.
All of this is useless if the plant hasn't been trained properly and you just have main branches with little side branching.
Dont forget, some strains or phenos don't respond well to ScrOGing.
I would say trimming off below the screen now for you wouldn't be the best of things as they are a fair amount in.
Maybe trim half the branches which have tiny popcorn buds and leave the ones with longer bud branches? Note what worked best for you and learn for your next grow.
Do however trim all the fan leaves off below the screen. They will die soon anyway!
Increase the airflow!
Here's the link to my diary, and a grow guide in that post that I wrote up which might help you a bit.
https://www.rollitup.org/grow-journals/403940-stealthdrobe-v1-600w-hydro-soil-7.html#post5393995
Hope that kinda helps!
I'm very high, have no idea how I got to this thread, I just started typing a reply about 2 hours ago between ad breaks. Haha.
Take it easy mate!
TD